By MARCIA DUNN AP Aerospace Writer CAPE CANAVERAL, Fla. (AP) — Four astronauts arrived at Kennedy Space Center on Sunday for SpaceX's second crew launch, coming up next weekend. For NASA, it marks the long-awaited start of regular crew rotations at the International Space Station, with private companies providing the lifts. There will be double the number of astronauts as the test flight earlier this year, and their mission will last a full six months. 'Make no mistake: Every flight is a test flight when it comes to space travel. But it's also true that we need to routinely be […]

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